Commissioning
IM/265D/V-EN-02 265Dx, 265VS 37
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6 Commissioning
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Once the transmitter has been installed, it is put into operation by switching on the operating
voltage.
Check the following before switching on the operating voltage:
• Process connections
• Electrical connection
• The measuring pipe and measuring chamber of the measuring equipment must be
completely filled with the measuring medium.
The transmitter can then be put into operation. To do this, the shut-off valves must be actuated
in the following order (in the default setting, all valves are closed):
265Dx
1. Open the shut-off valves on the pressure tap connection (if present).
2. Open the pressure equalization valve of the manifold.
3. Open the positive shut-off valve.
4. Close the pressure equalization valve.
5. Open the negative shut-off valve.
265Vx
1. Open the shut-off valve on the pressure tap connection (if present).
2. Open the positive shut-off valve.
To put the transmitter out of operation, carry out the steps in reverse order.
Important
In the case of the 265Vx pressure transmitter for absolute pressure with a measuring range of
400 mbar abs., please be aware that the measuring equipment will have been overloaded by
the atmospheric pressure due to the long periods of transport and storage involved. For this
reason, you will need to allow a starting time of approx. 30 min. after commissioning, until the
sensor has stabilized to such an extent that the specified accuracy can be maintained.
If, when using "intrinsically safe" transmitters, an ammeter is connected to the output circuit or a
modem is connected in parallel while there is a risk of explosion, the sums of the capacitances
and inductances of all circuits, including the transmitter (see EC-type-examination certificate)
must be equal to or less than the permissible capacitances and inductances of the intrinsically
safe signal circuit (see EC-type-examination certificate for the supply unit). Only passive or
explosion-proof devices or indicators may be connected.
If the output signal stabilizes only slowly, it is likely that a large damping time constant has been
set on the transmitter.
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